Thank you very much for the report and the test program! This helps me immensively to reproduce the problem.

The autoclose issue is a bug. The fix for it is simple - the shutdown is always killing Chrome instead of checking whether it should try to do that:

sub close {
    ...
    if( $_[0]->{autoclose} ) {
        $_[0]->kill_child( $_[0]->{cleanup_signal}, $pid, $_[0]->{wait
+_file} );
    }
}
[download]

But now I have to think about what my test suite tests and how I can test this case better... Then I will release a fixed version :)